182 State Horticultural Society. 



than a bushel of rotten fruit — 98.9 per cent of crop sound; but 

 practically as good results can be obtained with less spraying. 



Check A was an unsprayed tree which had only one sound ap- 

 ple and ten bushels of rotten fruit. 



Check B, which was one tree not sprayed, had six sound apples 

 and 17 bushels of rotten stuff. 



On plots 10 to 17 it will be seen that the early applications 

 for scab were omitted, but that whenever the spraying began in 

 June the results were satisfactory, or nearly so. 



In plot 16 it will be seen that four applications, at intervals 

 of two weeks, beginning June 27th, gave 52 1/^ bushels of sound 

 fruit and only 3% bushels of rotten fruit, or 93.3 per cent of sound 

 fruit; while the unsprayed trees nearly lost their entire crop from 

 the rot. 



By comparing plots 12 and 15, each of which received four ap- 

 plications, it will be seen that a delay of two weeks (July 10 to 

 25) in beginning the work caused a loss of 37 per cent of the crop, 

 which represents the difference between success and failure. The 

 same lesson is learned by comparing plot 11 with plot 12 and plot 

 7 with plot 8. 



The unsprayed trees, C and D, lost their entire crop from bit- 

 ter rot, and E, which was also not sprayed, had only a quarter of a 

 bushel of sound fruit and 16Vi bushels of rotten fruit. An un- 

 sprayed block of 250 trees in the same orchard lost practically the 

 entire crop from rot. 



The conditions were very favorable to bitter rot, June and 

 July being hot and wet, and the disease began to develop soon after 

 the middle of June. 



All diseased fruits on the trees in the experiment were left 

 undisturbed until picking time, in order to give the spraying a se- 

 vere test. 



RECOMMENDATIONS. 



Concluding from the results of these experiments, we would 

 recommend : 



1. For the treatment of bitter rot alone, spray the trees thor- 

 oughly with Bordeaux mixture at intervals of two weeks until four 

 or five applications have been made, beginning not later than six 

 weeks after the petals fall — usually about the middle of June in this 

 locality. 



2. For the combined treatment of apple scab, codling moth 

 and bitter rot, spray with Bordeaux mixture and arsenical poison. 



